When the diagnosis code No. B1731 is set, be sure to diagnose the CAN bus line.
When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the necessary data cannot be received from engine-ECU via CAN bus line during the engine starting certification with engine-ECU, OSS-ECU determines that a problem has occurred, and sets the diagnosis code No.B1731. At the same time, OSS-ECU displays the immobilizer certification system inspection warning screen to the multi information display of the combination meter.
JUDGEMENT CRITERIA
Check Conditions
At engine starting certification
Judgment Criterion
At the engine starting certification with engine-ECU, necessary data cannot be received from engine-ECU via CAN bus line.
PROBABLE CAUSES
Malfunction of the CAN bus line
Malfunction of engine-ECU
Malfunction of OSS-ECU
DIAGNOSIS PROCEDURE
1.M.U.T.-III CAN bus diagnosis 2.Engine-ECU diagnosis code check 3.OSS-ECU diagnosis code recheck